The building we’re talking about isn’t haunted by ghosts — that we know of — but it is haunted by unanswered questions. Why is there a barely marked tomb in a busy park? Is anyone buried there? And if there is … how many other human remains might be lurking beneath pretty Lincoln Park?

This small stone building nestled in the curve of LaSalle Drive behind the Chicago History Museum is the Couch Tomb, one of the only hints to visitors that the southern tip of Lincoln Park was once the Chicago City Cemetery.